Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_error_reporter.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_ERROR_REPORTER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_ERROR_REPORTER_H_
-#pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/string16.h"
 
 class MessageLoop;
 
 // Exposes an easy way for the various components of the extension system to
 // report errors. This is a singleton that lives on the UI thread, with the
@@ skipping 27 matching lines @@
 
   explicit ExtensionErrorReporter(bool enable_noisy_errors);
   ~ExtensionErrorReporter();
 
   MessageLoop* ui_loop_;
   std::vector<string16> errors_;
   bool enable_noisy_errors_;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_ERROR_REPORTER_H_